This type of case packer drops product into a case from above. Different types of drop packers are required for different types of items. Bags of chips can drop off a conveyor into a box. Other products such as plastic jars of nuts can be arranged into a specific order, and then an empty case is raised from the lower conveyor by a lifting mechanism and the product is then "dropped" into the case or tray. Glass bottles can also be packed using this method, but usually they are first surrounded by paperboard or corrugated cardboard to protect the glass.